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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74039f7131878724f0d80feefca8ebbced05f7114672d4ce498ff34b9e92f39f' 
  AND token = 'AOj8f2rPuOVlXRuXZUvKvVUReO38F8s8eI3jX440b/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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