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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06fb1068852bd1c50f085d7fbc8e63f7c9d7daaa2969e1e77d69f8e5cee533ea' 
  AND token = '/xzm2BMO5yGoiZOcCr9RQ1TJtg1vRq+ade5Nw+dcl+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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