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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4817d75715350c7a7b27be8b567e2f4db788eb1dcee7de4b3211a0e20e919b5a' 
  AND token = 'DAvbEPxl33xYsQm7EoMuoZFjFA3fQQ3Zp+2s7Fl97m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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