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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d08ac277300bac1108acf9f3006ca5b36aad30ffb703ca0f8c13d1a0ff87f1' 
  AND token = 'FcbRQAys+9UKng640FncbRAzyGbZRLa+ntf1kGX86eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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