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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7369355a5a445fb774a0f16f8cc37735110fa75231077477ab2d0477da41416c' 
  AND token = '08W+bXDQ8n7fT29Jjfypfck44vg+b6F1D3t2bEtsiUM=' 
  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"
    }
  }
}