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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f295f398648bd597c46ad75d08dd46875f14a638926ae95a2c439228db6dc07' 
  AND token = 'shq2JLU6O4kaa0jtsvw2HKpPenGa2kbc3YvKPwk2iDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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