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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10846a5d91ff3d9e2810cfc4b72aa1a070ce51badb66d7cca1bfdbeacee6a6ce' 
  AND token = 'Mn+CXUmAAMkvf+nSKZ3iy7WM23s6FBhy+JXT6t4gW9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}