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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2499a89062d807787586c4bf16e38a8b5926da4279bc033786df00d709bff373' 
  AND token = '2gVaTcfY2Rr/Z0EjXt4184wfzO4FvmImLV6dqxgyFnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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