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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57de6e7c2b6e68948e1a7c0ffc6e3f9762ba88b3732d72b1f4bf10785bf5fe1c' 
  AND token = '+v6etKa3DaXtauwMo1U2ueM94rz+KqZLRDQC3Rntr4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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